By far easiest is just to use lambda in place
self.option1 = Button[frame, text="1842",
command=lambda: self.checkAnswer[question=3, answer=2]]
Though, in a similar but a bit more complicated cases, you really should use a function factory such as
def answerCheckerFactory[self, question, answer]:
def checker[]:
return self.checkAnswer[question, answer]
return checker
...
self.option1 = Button[frame, text="1842",
command=self.answerCheckerFactory[question=3, answer=2]]
because it would make sure that you pass in correct arguments [not quetsion [sic] for example]; notice the difference from functools.partial which allows you to mistype the function arguments and get an exception only when clicked on the button ;]
Also, hardcoding the questions / answers in the button code does not seem right...
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In this article, we are going to see how to assign a function to a variable in Python. In Python, we can assign a function to a variable. And using that variable we can call the function as many as times we want. Thereby, increasing code reusability.
Implementation
Simply assign a function to the desired variable but without [] i.e. just with the name of the function. If the variable is assigned with function along with the brackets [], None will be returned.
Syntax:
def func[]:
{
..
}
var=func
var[]
var[]Example:
Python3
def a[]:
print["GFG"]
var=a
var[]
Output:
GFG
The following programs will help you understand better:
Example 1:
Python3
x = 123
def sum[]:
x = 98
print[x]
print[globals[]['x']]
print[x]
z = sum
z[]
z[]
Output:
123 98 123 98 123
Example 2: parameterized function
Python3
def even_num[a]:
if a % 2 == 0:
print["even number"]
else:
print["odd number"]
z =
even_num
z[67]
z[10]
z[7]
Output:
odd number even number odd number
Example 3:
Python3
def multiply_num[a]:
b = 40
r = a*b
return r
z = multiply_num
print[z[6]]
print[z[10]]
print[z[100]]
Output:
240 400 4000
Recommended Answers
Not unless you are going to use "exec[]" and people advise against that.
The second way is a good way.
class Test: def Testing[self]: # Run function x = Test[] x.Testing[]
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Simply store the reference to the function in the variable. Here is example:
def one[]: print["hello from function one"] def two[]: print["hello from function two"] def three[]: print["hello from function three"] # stores the ref of function in variable f1 = one f2 = two f3 = …
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All 8 Replies
redyugi 5 Junior Poster in Training Not unless you are going to use "exec[]" and people advise against that. The second way is a good way.class Test:
def Testing[self]:
# Run function
x = Test[]
x.Testing[]
bumsfeld 413 Nearly a Posting Virtuoso
12 Years AgoSimply store the reference to the function in the variable. Here is example:
def one[]:
print["hello from function one"]
def two[]:
print["hello from function two"]
def three[]:
print["hello from function three"]
# stores the ref of function in variable
f1 = one
f2 = two
f3 = three
func_list = [f1, f2, f3]
for f in func_list:
# show the function reference
print[f]
# call the function
f[]
"""my display -->
hello from function one
hello from function two
hello from function three
"""
redyugi 5 Junior Poster in Training
12 Years AgoSimply store the reference to the function in the variable. Here is example:
def one[]: print["hello from function one"] def two[]: print["hello from function two"] def three[]: print["hello from function three"] # stores the ref of function in variable f1 = one f2 = two f3 = three func_list = [f1, f2, f3] for f in func_list: # show the function reference print[f] # call the function f[] """my display --> hello from function one hello from function two hello from function three """
I never knew I could do that. I knew you could do it with a class instance but...thanks
12 Years Ago
Awesome. That solves a tonne of problems. Thanks. =]
4 Years Ago
I need help on my Python project. I am creating a guess the number game and I need to include a menu, collect statistics, and plot statistics results. I have already created the game, but I don't know how to include a menu, collect statistics, or plot the results. Please help!!
3 Years Ago
Hi,
I too have same functinality like you guys posted here...
it iis working fine when I pass arguments to defined functions.
going wrong if the function is specified with "self"
Ex:
class Anyclassname:
def __init__ [self, a]:
self.a = a
def one[self, dicti]:
print["hello from function one"]
print[self.a, dicti]
## Assume that instance is created function is called refering eith instance
for f in func_list:
# show the function reference
print[f]
# call the function
dicti = {'1': 'one'}
f[dicti]
#throwing error as "Print the exception one[] missing 1 required positional argument: 'dicti'"Please help me with this...
3 Years Ago
Hi @Akshay_15,
Why not post your question as a new topic instead of commenting on an old post here ?
Edited 3 Years Ago by John_165
1 Year Ago
class Callback:
def __init__[self, fun, *args, **kwargs]:
self.fun = fun
self.args = args
self.kwargs = kwargs
def __call__[self]:
self.fun[*self.args, **self.kwargs]
def say[message]:
print[message]
if __name__ == "__main__":
callback = Callback[say, message="Hello"]
callback[]This would be more general solution.
Edited 1 Year Ago by tomas_petricek
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